In Pictures: 12 new updates in VMware vSphere 5.5

Low latency improvements
VMware has added a number of improvements at both the VM and hypervisor level to help improve overall latency. At the VM level, this consists of a single setting to indicate to vSphere the sensitivity to latency. For high sensitivity applications, the underlying hypervisor can do things like bypass the CPU scheduling algorithms and dedicate one or more CPU sockets exclusively to a single VM. Additional actions include reserving memory for a latency sensitive VMs and disabling networking features, such as coalescing and LRO vNIC support for predictable network response.

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